Research on Sintering Dynamics and Microwave Dielectric Properties of Bi and Mn Doped Lead-Based Ceramics

Abstract

The sintering dynamics, microstructures and microwave dielectric properties of Bi2O3 and
MnO2 co-doped [(Pb,Ca) La](Fe,Nb)O3 (PCLFN) ceramics were investigated. Bi2O3 and MnO2
dopants effectively enhanced bulk densities and reduced sintering temperatures by about 100~140°C.
Sintering procedure had significant effect on grain size and porosities of ceramics. Investigation of
microstructures revealed that the grain growth was controlled by either volume diffusion or
second-order interface mechanism in present ceramics. The potential microwave dielectric properties
of εr=91.1,Qf=4870GHz and τf=18.5ppm/°C could be obtained when the mass ratio of Bi2O3/MnO2
(k) was 1, the doping content w=1wt% and sintered at 1050°C for 4h.